Single-exposure dual-energy computed radiography: improved detection and processing.
Recent reports have emphasized the potential for dual-energy computed radiographic applications. An improved method for single-exposure material-selective imaging with a photostimulable phosphor computed radiography system was investigated. The essential elements of the technique are (a) prefiltration with gadolinium, which divides the incident broad-beam x-ray spectrum into low-energy and high-energy peaks; (b) a cassette consisting of four photostimulable phosphor plates that record images of increasing mean energies, with a computed energy separation of 23 keV from the front to the rear plate; (c) spatially dependent scatter and beam-hardening corrections; and (d) a noise-reduction algorithm based on noise correlations between bone-selective and soft-tissue-selective dual-energy images. These elements result in improved material cancellation and signal-to-noise ratio throughout the image.
Ergun
D L
DL
Philips Medical Systems North America, Shelton, CT 06484.
Mistretta
C A
CA
Brown
D E
DE
Bystrianyk
R T
RT
Sze
W K
WK
Kelcz
F
F
Naidich
D P
DP
D000465:Algorithms; D006801:Humans; D015900:Radiography, Dual-Energy Scanned Projection; D013679:Technology, Radiologic; D014057:Tomography, X-Ray Computed